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Volcano Info
EnchantedLearning.com
Volcano Dictionary

Volcano Activities and Printouts
Types of Volcanoes The Ring of Fire
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

L



laccolith

A laccolith (also called a plutonic formation or an igneous intrusion) is a formation in which magma (molten rock) is trapped beneath the surface of the Earth and pushes the rock located above it into a dome shape. It has a flat base and a convex upper surface. The magma cools and solidifies, and eventually, it is exposed (as the fractured sedimentary rock above it erodes away). Laccolith means "cistern stone" in Greek.


lahar

A lahar (also called a mudflow or debris flow) is a moving mixture of rock, water, and other debris that falls down the slopes of a volcano and/or a river valley. Lahar is an Indonesian word

lapilli

Lapilli are pieces of rock or lava that range from 2 and 64 millimeters across. Lipilli are thrown into the air by volcanic explosions

lateral blast

A lateral blast is a volcanic eruption that occurs on the side of a volcano; the energy of the blast is directed horizontally.

latitude

Latitude is the angular distance north or south from the equator to a particular location. The equator has a latitude of zero degrees. The north and south poles have a latitude of 90 degrees. The rest of the world is between zero and ninety degrees.
Laurasia

Laurasia

Laurasia was the northern supercontinent formed after Pangaea broke up during the Jurassic period. Laurasia included what are now North America, Europe, Asia, Greenland, and Iceland.


lava

Lava is molten rock. It usually comes out of erupting volcanoes.

lava bomb

A volcanic bomb is a chunk of viscous lava (over 64 mm) that is ejected (thrown) from a volcano. Since they are still viscous when ejected, they often have rounded, aerodynamic shapes. Type of bombs include: breadcrust bombs, ribbon bombs, spindle bombs, spheroidal bombs, and "cow-dung" bombs.


lava dome

A lava dome is a dome-shaped mound that is formed around a vent by viscous lava.


lava flow

A lava flow is moving mass of molten lava on the Earth's surface. The solidified lava deposit from a molten lava flow is also called a lava flow.


lava lake

A lava lake is a lake of basaltic lava contained in a volcanic caldera.


lava tube

A lava tube is a tube-like, underground conduit formed by flowing lava. The flowing lava crusts over at the edges and drains out onto lower ground - what is left is a smooth, tube-like tunnel with hanging lava stalactites and a flat floor - a lava tube.

LIDAR

Lidar stands for Light Detection and Ranging. Lidar a type of radar that uses laser light (instead of microwaves) to provide information.

liquid

Liquid is a phase of matter in which the molecules are close together and can move around slowly.


lithosphere

The lithosphere is the solid, rocky, outer part of the Earth consisting of the crust and the upper mantle.

lithospheric plates

Llithospheric plates are a series of slabs that make up the Earth's hard outer shell. There are 16 major lithospheric plates that float on softer layers of the Earth's mantle.


Littoral Zone

The littoral (intertidal) zone is where the sea meets the land.

loess

Loess is a deposit of tiny, windblown particles.

longitude

Longitude is the angular distance east or west of the prime meridian (the north-south line that passes through Greenwich, England) to a particular location. Greenwich, England has a latitude of zero degrees. The farther east or west of Greenwich you are, the greater your longitude. Midway Islands (in the Pacific Ocean) have a longitude of 180 degrees (they are on the opposite side of the globe from Greenwich).


Volcano Info
EnchantedLearning.com
Volcano

Volcano Activities and Printouts
Types of Volcanoes The Ring of Fire
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the volcano term you are looking for is not in the dictionary, please e-mail us.

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